EP0157134B1 - Length control in winding threads - Google Patents
Length control in winding threads Download PDFInfo
- Publication number
- EP0157134B1 EP0157134B1 EP85101669A EP85101669A EP0157134B1 EP 0157134 B1 EP0157134 B1 EP 0157134B1 EP 85101669 A EP85101669 A EP 85101669A EP 85101669 A EP85101669 A EP 85101669A EP 0157134 B1 EP0157134 B1 EP 0157134B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- package
- winding
- rotation
- yarn
- effective length
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004804 winding Methods 0.000 title claims description 47
- 238000002789 length control Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 description 17
- 238000009987 spinning Methods 0.000 description 13
- 238000012937 correction Methods 0.000 description 9
- 238000009825 accumulation Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013519 translation Methods 0.000 description 3
- 230000003466 anti-cipated effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010040 friction spinning Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010042 air jet spinning Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007383 open-end spinning Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
- B65H63/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
Definitions
- the present invention relates to a method and apparatus for controlling the length of thread wound into a package in a yarn processing machine having a package winding unit in which the package is driven, preferably by frictional contact, with a suitable drive means.
- the invention is intended particularly, but not exclusively, for use in a yarn processing machine comprising a plurality of yarn processing stations having independently operable package winding units. Examples of such machines include rotor spinning machines, false twist texturising machines, automatic back winding machines, air jet spinning machines and friction spinning machines.
- the wind-up sections of the operating stations will normally be independently operable in the sense that a winding operation at one station can be started and terminated without affecting winding operations at the other stations associated with the same friction drive shaft. This can be achieved quite simply by selectively terminating supply of yarn at individual stations and/ or, preferably, by moving the yarn package out of contact with the friction drive shaft at the station at which winding is to be terminated.
- the German Specification also suggests that the length of thread wound per rotation of the drive roll or per pulse can be measured and used as input data in calculation of the required setting for the adjustable counter.
- the length of thread wound per revolution of the drive roll depends not only upon the drive roll diameter but also upon the degree of slip between the roll and the package. This latter may vary during an individual winding operation, for example with increase in pressure of the package building up at the winding station. Furthermore, the degree of slip may vary between successive winding operations if, for example, there is a change of thread material so that the friction conditions in the contact region change.
- German Specification No. 2216960 could be operated so as to allow for slip and other factors arising in the package drive system, it is not specifically designed for that purpose and is hence not convenient for the machine user or for use with equipment handling data relating to thread length wound.
- the invention provides a yarn winding apparatus comprising means for rotating a yarn package during a winding operation, means to. produce an output signal which is a function of rotation of a part of said rotating means such that for any required effective length of yarn in said package there is a corresponding determinable rotation of said part, and means to receive said output signal and to provide a winding termination signal when a predetermined rotation of said part as represented by said output signal has accumulated during a given winding operation, characterised in that both the required effective length of yarn and the said function are independently adjustably settable by the user of the apparatus, said means to receive said output signal being adjustably settable by the user of the apparatus to represent the required effective length of yarn in the package, and a modifying means being provided, controllably adjustable by the user of the apparatus to modify said function so that for a given set effective length the actual rotation of said part which accumulates during a winding operation prior to generation of said winding termination signal can be brought into correspondence with said determinable rotation.
- the invention further provides a method of producing yarn packages of desired effective length by means of a wind-up comprising a package drive and a package length control device adjustable by the user to respond in a controllably variable manner to rotation of a part of the drive and additionally settable by the user to cause termination of winding after predetermined rotation of said part, the method being characterised by the steps of setting the device to cause termination of winding after completion of packages of a desired effective length, adjusting the device to respond in one manner to rotation of said part, measuring the effective length of yarn which can be unwound from at least one package produced with the device so adjusted and set, and altering the adjustment if necessary, while maintaining the setting, to cause the device to respond in another manner to rotation of said part to make the actual effective length equal to the desired effective length.
- the invention is especially useful in combination with a data processing system for processing package length data in a multi-station machine.
- the portion above the chain dotted line represents the yarn handling or processing part of the apparatus, that is the predominantly mechanical aspects of the system.
- the portion of the drawing below the chain dotted line represents the length control elements, that is the predominantly electrical portions.
- the portion of the drawing shown in full lines may be assumed to represent one yarn-processing station of a multi-station machine.
- the main yarn processing unit is indicated diagrammatically by the box 10 and the yarn leaving this unit is indicated at 12.
- the processing unit 10 can, for example, be a spinning unit (for example a rotor, jet or friction spinning unit) or a cop-back winding unit or a false twist texturising unit.
- Yarn 12 leaving the unit 10 is passed to a wind-up generally indicated by the numeral 14.
- Unit 10 will be assumed herein to be a spinning unit.
- Wind-up 14 comprises a drive roll 16 which is cylindrical and is rotatable about its own longitudinal axis (not shown).
- a suitable, controllable drive means (not shown) is provided to rotate the drive roll at a desired rotational speed.
- This drive means will be referred to again later in the specification, but the invention does not require any specific form of roll or drive means.
- the wind-up further comprises a conventional form of package cradle comprising a pair of arms 18, 20 respectively connected to a carrier (not shown) for rotational movement together about a common carrier axis 22. At their ends remote from the carrier; arms 18, 20 carry between them in use a bobbin tube diagrammatically indicated at 24.
- arms 18, 20 can be pivoted to bring tube 24 into frictional contact with rotating drive roll 16 so that the tube is rotated about its own longitudinal axis.
- Thread 12 passing to the wind-up 14 is secured to tube 24 by any suitable means (not shown) and is drawn into a package forming on the tube by rotation of the latter due to contact of the tube or the package with drive roll 16.
- a suitable traverse mechanism (not shown) of conventional form is provided in the wind-up 14 so as to traverse thread 12 longitudinally of the bobbin tube 24 so as to enable build of a package of desired form.
- Roll 16 is provided with an indicator element 26 which rotates with the roll.
- a detector 28 is arranged near the periphery of the roll, and responds to indicator element 26 to produce one output pulse per revolution of. the roll.
- the output signal from detector 28 is therefore a series of pulses at a pulse rate F1 which is a function of the speed of rotation of the roll.
- the output signal from detector 28 is fed to a divider indicated diagrammatically at 30, which produces an output signal having a pulse rate F2 where
- K is settable by suitable adjuster means acting on the divider 30 by way of an input 32.
- Counter 34 is set to accumulate a predetermined pulse count, representing a desired length of thread wound into a package at wind-up 14, and then to issue a winding termination signal which is passed to the spinning unit 10 as indicated by the line 36 in the drawing.
- the count which has to be accumulated before issue of the winding termination signal is adjustable within a predetermined range by an adjuster means (not shown) acting via the input 38.
- the pulse count SC set into the counter 34 is a predetermined linear function of L and is determined by a translation device built into the data input 38. The user thus enters a desired length as described above and the translation device converts this into the corresponding pulse count setting SC in accordance with the predetermined translation function.
- a second reason is that the package is wound with a certain tension on the yarn 12 as it is drawn into the package.
- the yarn is therefore elastically stretched to a degree dependent upon its own structure and the winding tension applied.
- the yarn will be subjected to totally different tension conditions which will be dependent upon the type of unwinding operation involved.
- the yarn may therefore relax during unwinding so that the effective package length is still shorter.
- the yarn may however be stretched still more during unwinding, in which case its effective length may appear long relative to the corresponding roll rotation.
- the machine user takes sample packages and unwinds them under the anticipated operating conditions while applying a suitable length measuring technique to measure the effective length of the thread in each sample package.
- a suitable length measuring technique to measure the effective length of the thread in each sample package.
- This enables estimation of an average percentage error, for example the average measured package length will be found to be only 98% of the set length (i.e. 98 km in the example chosen above).
- a plurality of packages are measured in this way to give a statistically reliable error estimation.
- the divisor K is now adjusted at input 32 in accordance with the error measured as described above.
- the actual entry to be made at input 32 is dependent upon the capabilities of the input devices and the correction format adopted. If the input devices are appropriately designed, the user may in the assumed example enter 98% (i.e. the actual measured effective length) and the input device will convert this data to an appropriate correction of the divisor K, in this case into an appropriate increase in K with a corresponding increase in the number of pulses N (revolutions of roll 16) required to reach the set count SC. Alternatively, the required increase in K may be calculated by the user and entered as such at input 32, in which case the input devices at input 32 can be made simpler.
- Each spinning position then has its own individual wind-up and spinning unit; spinning and winding can be terminated at any individual position without affecting operations at any other position, for example by cancelling feed of fibre material to the spinning position where spinning is to be terminated and preferably lifting the package at that position away from the drive shaft 16.
- the data transmission system forms part of a data processing system which enables presentation of operating data "on-line” to the mill management. It is therefore associated with read-out equipment enabling read-out on demand and/ or at intervals of data stored in the register of the data processing system.
- the "counters" 34, 340 etc. may then be provided by a suitable length storage register with individual cells corresponding to individual operating stations. Each cell stores data representing the effective length of the package currently winding at its associated station.
- the data processing system can include still further registers containing data representative of the total effective length of yarn produced by the machine over a given period. This can be compared with the total theoretically possible output of yarn over the same period, giving a measure of efficiency of operation of the machine. This description gives an outline only of the type of data available from such systems-many other features related to yarn length can also be provided, for example a figure of thread breaks per unit length (say 1000 m) of yarn produced.
- the output of the pulse producing means (represented by roll 16, pulse generator 28 and divider 30 taken together) is corrected for each revolution of the roll 30.
- the same effect could of course be achieved in theory by adjusting the number of pulses emitted by detector 28 per revolution of the roll, for example by adapting the number of indicator elements on the roll. This is however unlikely to prove a really practical alternative to adjustable modification by the divider 30 of the output of the signal generator which responds directly and in a predetermined manner to the rotation of the roll.
- the system described in DE-B 2216960 could also be operated to put into effect a method according to the present invention.
- the user Using the formula given in col. 4 of the document, the user must adjust the dividing factor so as to take account of both the error effect and the fixed capacity of the count store.
- the apparatus according to the present invention providing both an effective length setting and a correction adjustment, is more flexible, less liable to risk of error and thus more convenient for the machine user.
- the invention is not limited to friction drives. As indicated above, length variation factors may be unrelated to slip in the drive system and accordingly the present invention may be useful even where such slip is effectively excluded e.g. in spindle-driven wind-ups.
- the drawing illustrates the most economical embodiment in which a single pulse generator and divider deliver pulses to a plurality of processing stations. This is of course only possible where the drive roll 16 is common to those stations. Even in that case, additional modifications are possible at the cost of added complexity and expense, for example a single pulse generator could feed a plurality of dividers associated with individual processing stations, thus enabling the use of correction coefficients individual to the stations.
- the correction coefficients could be variable according to a predetermined function over the period of the winding operation.
- a signal could be derived in response to the state of the individual counter 34 so as to cause continuous or stepped variation of the associated correction coefficient.
- the "effective" length of a thread package is dependent upon the circumstances of use, in particular upon the conditions under which the package has been produced (wound) and those under which it will be used (unwound) in the next processing stage. There is no “absolute” length of thread in a package; the “effective" length must be determined in practice from case to case.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
- Winding Filamentary Materials (AREA)
Description
- The present invention relates to a method and apparatus for controlling the length of thread wound into a package in a yarn processing machine having a package winding unit in which the package is driven, preferably by frictional contact, with a suitable drive means. The invention is intended particularly, but not exclusively, for use in a yarn processing machine comprising a plurality of yarn processing stations having independently operable package winding units. Examples of such machines include rotor spinning machines, false twist texturising machines, automatic back winding machines, air jet spinning machines and friction spinning machines.
- It is common practice in the thread winding art to use a friction drive roll (or "drum") to rotate a thread or yarn package during a winding operation by frictional contact with the package. In multi-station machines, in which a plurality of operating stations are arranged side by side in a row, a single driven shaft may function as the friction drive roll for all of the stations in the row, or each station may be provided with its own independently drivable and stoppable friction roll.
- Even where the friction drive roll of a plurality of operating stations is provided by a single, rotatable shaft, the wind-up sections of the operating stations will normally be independently operable in the sense that a winding operation at one station can be started and terminated without affecting winding operations at the other stations associated with the same friction drive shaft. This can be achieved quite simply by selectively terminating supply of yarn at individual stations and/ or, preferably, by moving the yarn package out of contact with the friction drive shaft at the station at which winding is to be terminated.
- There is an increasing trend to provide such machines with length control systems for determining the length of thread wound into each individual package. In W. German published Patent Application (Auslegeschrift) No. 2216960 and in US Patent Specification No. 3988879, length control systems are described in which pulses emitted by a pulse emitter responsive to rotation of a friction drive roll are accumulated in a counter means. An adjustably settable correction factor can be set into the counter means so as to adapt the variable pulse count, corresponding to variable required package length, to a fixed accumulator capacity.
- The German Specification also suggests that the length of thread wound per rotation of the drive roll or per pulse can be measured and used as input data in calculation of the required setting for the adjustable counter.
- It is also well known that friction drive systems suffer from the problem of slip at the region of contact between the drive roll and the package. Accordingly, the length of thread wound per revolution of the drive roll depends not only upon the drive roll diameter but also upon the degree of slip between the roll and the package. This latter may vary during an individual winding operation, for example with increase in pressure of the package building up at the winding station. Furthermore, the degree of slip may vary between successive winding operations if, for example, there is a change of thread material so that the friction conditions in the contact region change.
- A solution to this latter problem has been proposed in W. German published Patent Specification (Offenlegungsschrift) No. 3242318. This system involves continuous estimation of the degree of slip during a winding operation. This estimation is then used to modify a signal representing rotation of the friction drive roll so that the modified signal represents wound thread length more accurately.
- The system described in the last mentioned specification is complex and therefore expensive to put into practical operation. Furthermore it can take account of slip only, whereas other factors can also affect the "effective length" of a thread package during unwinding thereof as further described later.
- While the system described in German Specification No. 2216960 could be operated so as to allow for slip and other factors arising in the package drive system, it is not specifically designed for that purpose and is hence not convenient for the machine user or for use with equipment handling data relating to thread length wound.
- It is an object of the present invention to provide a simple and convenient means of correcting for length variation factors in a length control system in a thread or yarn wind-up.
- The invention provides a yarn winding apparatus comprising means for rotating a yarn package during a winding operation, means to. produce an output signal which is a function of rotation of a part of said rotating means such that for any required effective length of yarn in said package there is a corresponding determinable rotation of said part, and means to receive said output signal and to provide a winding termination signal when a predetermined rotation of said part as represented by said output signal has accumulated during a given winding operation, characterised in that both the required effective length of yarn and the said function are independently adjustably settable by the user of the apparatus, said means to receive said output signal being adjustably settable by the user of the apparatus to represent the required effective length of yarn in the package, and a modifying means being provided, controllably adjustable by the user of the apparatus to modify said function so that for a given set effective length the actual rotation of said part which accumulates during a winding operation prior to generation of said winding termination signal can be brought into correspondence with said determinable rotation.
- The invention further provides a method of producing yarn packages of desired effective length by means of a wind-up comprising a package drive and a package length control device adjustable by the user to respond in a controllably variable manner to rotation of a part of the drive and additionally settable by the user to cause termination of winding after predetermined rotation of said part, the method being characterised by the steps of setting the device to cause termination of winding after completion of packages of a desired effective length, adjusting the device to respond in one manner to rotation of said part, measuring the effective length of yarn which can be unwound from at least one package produced with the device so adjusted and set, and altering the adjustment if necessary, while maintaining the setting, to cause the device to respond in another manner to rotation of said part to make the actual effective length equal to the desired effective length. The invention is especially useful in combination with a data processing system for processing package length data in a multi-station machine.
- By way of example, embodiments of apparatus and a method according to the invention will now be described with reference to the accompanying drawing representing a diagrammatic perspective view of a thread wind-up and an associated length control system.
- The principles involved will first be described with reference to the portion of the drawing illustrated in full line. The principles will then be extended to a system incorporating the modification illustrated in dotted lines. The illustrated winding and length control apparatus can be used in any of the machines mentioned in the introduction to this specification, and also in other types of machines which will not be dealt with herein detail.
- In the drawing, the portion above the chain dotted line represents the yarn handling or processing part of the apparatus, that is the predominantly mechanical aspects of the system. The portion of the drawing below the chain dotted line represents the length control elements, that is the predominantly electrical portions. The division is arbitrary and purely for convenience of organisation of the following description, since in operation the mechanical and electrical features are interdependent.
- The portion of the drawing shown in full lines may be assumed to represent one yarn-processing station of a multi-station machine. The main yarn processing unit is indicated diagrammatically by the
box 10 and the yarn leaving this unit is indicated at 12. Theprocessing unit 10 can, for example, be a spinning unit (for example a rotor, jet or friction spinning unit) or a cop-back winding unit or a false twist texturising unit.Yarn 12 leaving theunit 10 is passed to a wind-up generally indicated by thenumeral 14.Unit 10 will be assumed herein to be a spinning unit. - Wind-up 14 comprises a
drive roll 16 which is cylindrical and is rotatable about its own longitudinal axis (not shown). A suitable, controllable drive means (not shown) is provided to rotate the drive roll at a desired rotational speed. This drive means will be referred to again later in the specification, but the invention does not require any specific form of roll or drive means. The wind-up further comprises a conventional form of package cradle comprising a pair ofarms common carrier axis 22. At their ends remote from the carrier;arms - During a winding operation,
arms tube 24 into frictional contact with rotatingdrive roll 16 so that the tube is rotated about its own longitudinal axis.Thread 12 passing to the wind-up 14 is secured totube 24 by any suitable means (not shown) and is drawn into a package forming on the tube by rotation of the latter due to contact of the tube or the package withdrive roll 16. A suitable traverse mechanism (not shown) of conventional form is provided in the wind-up 14 so as to traversethread 12 longitudinally of thebobbin tube 24 so as to enable build of a package of desired form. - The type of wind-up described above is perfectly conventional and examples can be seen in US Patent Specification Nos. 3942731, 3356306 and 4352466.
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Roll 16 is provided with anindicator element 26 which rotates with the roll. Adetector 28 is arranged near the periphery of the roll, and responds toindicator element 26 to produce one output pulse per revolution of. the roll. The output signal fromdetector 28 is therefore a series of pulses at a pulse rate F1 which is a function of the speed of rotation of the roll. -
- The value of K is settable by suitable adjuster means acting on the
divider 30 by way of aninput 32. - While
thread 12 is being wound into a package in winder 14, the pulse output ofdivider 30 is passed to acounter 34.Counter 34 is set to accumulate a predetermined pulse count, representing a desired length of thread wound into a package at wind-up 14, and then to issue a winding termination signal which is passed to thespinning unit 10 as indicated by theline 36 in the drawing. The count which has to be accumulated before issue of the winding termination signal is adjustable within a predetermined range by an adjuster means (not shown) acting via theinput 38. - Counting of pulses to represent thread wound into a package is now standard practice in the yarn processing art, and no attempt has been made to explain all aspects of such a system in this specification. Means is provided to start the pulse accumulation in
counter 34 at the start of a given winding operation and accumulation continues until that winding operation is complete as represented by the accumulation of the preset number of pulses. The accumulation must be interrupted when the winding operation is interrupted. This is indicated purely diagrammatically in the drawing by thelink 40. This extends from athread monitor 42 provided betweenspinning station 10 and wind-up 14 to aswitch 44 betweendivider 30 andcounter 34.Switch 44 is closed while thread is being supplied fromunit 10 to wind-up 14, and is open whenmonitor 42 indicates an interruption in such supply. It is emphasized that the interrupting system as illustrated is a relatively primitive one which is included merely for purposes of identification of the principles involved. A more complex system will be referred to later, but neither system forms an essential feature of the present invention. - Assume now that the machine user wishes to produce packages which when subsequently unwound will give a predetermined ("effective") length of thread, for
convenience 100 km. The user enters "100 km" atinput 38 and the input device automatically converts this into a predetermined accumulated pulse count (set count) which is set in thecounter 34. The user has at this stage no firm information regarding the slip conditions which will apply between thedrive roll 16 and the packages he wishes to produce or of other factors which may affect the effective package length. He therefore enters "100%" atinput 32; the significance of this entry, the form of which is purely arbitrary, is explained in the following paragraphs. - For the purposes of this explanation, it is convenient to convert the pulse rates referred to above into pulses per unit length. Assume that
detector 28emits 1 pulse per revolution ofroll 16. N pulses will then be emitted bydetector 28 during a winding operation in which N revolutions ofroll 16 are needed to produce a package of effective length L meters, counting only those revolutions which occur while thread is being drawn into the package i.e. excluding interruptions. Assuming constant roll speed, the pulse count (SC) set intocounter 34 by entry of "L" meters atinput 38 must be given by SC=N/K. The divisor K can be defined byinput 32 and Ks is a fixed "base divisor" given by F1/F2 when C=100%. Ks is determined in dependence upon the settable storage capacity ofcounter 34, the anticipated range of speeds of the roll and the required accuracy of the length measurement (higher accuracy-more pulses per revolution). - The pulse count SC set into the
counter 34 is a predetermined linear function of L and is determined by a translation device built into thedata input 38. The user thus enters a desired length as described above and the translation device converts this into the corresponding pulse count setting SC in accordance with the predetermined translation function. - Now, the above assumed entry of adjustment coefficient C=100% at
input 32 sets K=Ks and represents an assumption that no length variation factors are operating, that is an assumption that the desired effective package length L will be produced by UnD revolutions of thedrive roll 16, where D is the diameter of the roll. This assumption is, however, very unlikely to prove correct and the resultant packages will almost certainly not produce the desired length of thread L during unwinding. - One reason for this is the slip discussed in W. German specification No. 3242318. Such slip in the contact region between the roll and the package will tend to produce a package which is shorter than the desired length L with an adjustment coefficient of 100%.
- A second reason is that the package is wound with a certain tension on the
yarn 12 as it is drawn into the package. The yarn is therefore elastically stretched to a degree dependent upon its own structure and the winding tension applied. During unwinding, however, the yarn will be subjected to totally different tension conditions which will be dependent upon the type of unwinding operation involved. The yarn may therefore relax during unwinding so that the effective package length is still shorter. The yarn may however be stretched still more during unwinding, in which case its effective length may appear long relative to the corresponding roll rotation. The yarn manufacturer (machine user) therefore has to establish the conditions under which packages will be unwound before he can assess the error introduced by the C="100%" adjustment atdivider 32. - The machine user takes sample packages and unwinds them under the anticipated operating conditions while applying a suitable length measuring technique to measure the effective length of the thread in each sample package. This enables estimation of an average percentage error, for example the average measured package length will be found to be only 98% of the set length (i.e. 98 km in the example chosen above). Preferably of course, a plurality of packages are measured in this way to give a statistically reliable error estimation.
- The divisor K is now adjusted at
input 32 in accordance with the error measured as described above. The actual entry to be made atinput 32 is dependent upon the capabilities of the input devices and the correction format adopted. If the input devices are appropriately designed, the user may in the assumed example enter 98% (i.e. the actual measured effective length) and the input device will convert this data to an appropriate correction of the divisor K, in this case into an appropriate increase in K with a corresponding increase in the number of pulses N (revolutions of roll 16) required to reach the set count SC. Alternatively, the required increase in K may be calculated by the user and entered as such atinput 32, in which case the input devices atinput 32 can be made simpler. - It will be apparent that the designation "100%" for the "ideal" condition is purely arbitrary; any other designation could be used for the same purpose and the data entering device associated with
input 32 could be adapted accordingly. - For simplicity of illustration, the description so far has assumed a wind-
up 14 with its ownindividual drive roll 16 and its ownindividual counter 34. Individual drive rolls are commonly used in cop back-winding machines where termination of winding is effected by cancelling the drive to thedrive roll 16. In spinning machines, however, it is more common to use a drive shaft extending the full length of the machine as a friction roll common to all spinning positions on at least one machine side (two such rolls are provided in a double-sided machine). This is indicated by the dotted line extension of theshaft 16 in the drawing. Each spinning position then has its own individual wind-up and spinning unit; spinning and winding can be terminated at any individual position without affecting operations at any other position, for example by cancelling feed of fibre material to the spinning position where spinning is to be terminated and preferably lifting the package at that position away from thedrive shaft 16. - Since the parts of the additional positions are as far as possible identical to those of the first- described spinning position, they have been indicated by
similar reference numerals - In a modern multi-station machine (whether winder, spinning machine or texturising machine) the individual stations would almost certainly not be directly connected to their
respective counters - The data transmission system forms part of a data processing system which enables presentation of operating data "on-line" to the mill management. It is therefore associated with read-out equipment enabling read-out on demand and/ or at intervals of data stored in the register of the data processing system. The "counters" 34, 340 etc. may then be provided by a suitable length storage register with individual cells corresponding to individual operating stations. Each cell stores data representing the effective length of the package currently winding at its associated station. The data processing system can include still further registers containing data representative of the total effective length of yarn produced by the machine over a given period. This can be compared with the total theoretically possible output of yarn over the same period, giving a measure of efficiency of operation of the machine. This description gives an outline only of the type of data available from such systems-many other features related to yarn length can also be provided, for example a figure of thread breaks per unit length (say 1000 m) of yarn produced.
- The advantages of the present invention are particularly apparent when it is used in combination with such a system. Consider an alternative length correction system, in which the divisor at
unit 30 is fixed and length correction is achieved by entering a "false" setting for the pulse count at counter 34 e.g. by entering 102 km when a package of 100 km is required. Apart from the risk of confusion in operating of the machine, which could be dealt with by entering and displaying both a "true" set length and a corrected (or "false") set length, there is the disadvantage that only the zero and the final package length values extracted by the data processing system are correct-all of the intermediate values derived from the rotation of the friction roll during a winding operation are false. - In accordance with the present proposal, the output of the pulse producing means (represented by
roll 16,pulse generator 28 anddivider 30 taken together) is corrected for each revolution of theroll 30. The same effect could of course be achieved in theory by adjusting the number of pulses emitted bydetector 28 per revolution of the roll, for example by adapting the number of indicator elements on the roll. This is however unlikely to prove a really practical alternative to adjustable modification by thedivider 30 of the output of the signal generator which responds directly and in a predetermined manner to the rotation of the roll. - As indicated in the introduction to this specification, the system described in DE-B 2216960 could also be operated to put into effect a method according to the present invention. In that case, however, there is only a single adjustment possibility since the capacity of the store corresponding with
counter 34 in the present application is fixed. Using the formula given in col. 4 of the document, the user must adjust the dividing factor so as to take account of both the error effect and the fixed capacity of the count store. The apparatus according to the present invention, providing both an effective length setting and a correction adjustment, is more flexible, less liable to risk of error and thus more convenient for the machine user. - The invention is not limited to friction drives. As indicated above, length variation factors may be unrelated to slip in the drive system and accordingly the present invention may be useful even where such slip is effectively excluded e.g. in spindle-driven wind-ups.
- The drawing illustrates the most economical embodiment in which a single pulse generator and divider deliver pulses to a plurality of processing stations. This is of course only possible where the
drive roll 16 is common to those stations. Even in that case, additional modifications are possible at the cost of added complexity and expense, for example a single pulse generator could feed a plurality of dividers associated with individual processing stations, thus enabling the use of correction coefficients individual to the stations. In this case, the correction coefficients could be variable according to a predetermined function over the period of the winding operation. For this purpose a signal could be derived in response to the state of theindividual counter 34 so as to cause continuous or stepped variation of the associated correction coefficient. - From the foregoing description, it will be understood that the "effective" length of a thread package is dependent upon the circumstances of use, in particular upon the conditions under which the package has been produced (wound) and those under which it will be used (unwound) in the next processing stage. There is no "absolute" length of thread in a package; the "effective" length must be determined in practice from case to case.
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB848407465A GB8407465D0 (en) | 1984-03-22 | 1984-03-22 | Length control in winding of threads |
GB8407465 | 1984-03-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0157134A1 EP0157134A1 (en) | 1985-10-09 |
EP0157134B1 true EP0157134B1 (en) | 1988-05-04 |
Family
ID=10558514
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85101669A Expired EP0157134B1 (en) | 1984-03-22 | 1985-02-15 | Length control in winding threads |
Country Status (6)
Country | Link |
---|---|
US (1) | US4715550A (en) |
EP (1) | EP0157134B1 (en) |
JP (1) | JPS60213667A (en) |
DE (1) | DE3562477D1 (en) |
GB (1) | GB8407465D0 (en) |
IN (1) | IN163635B (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3716473A1 (en) * | 1987-05-16 | 1988-11-24 | Schlafhorst & Co W | METHOD FOR SORTING CROSS COILS ON A WINDING MACHINE |
DE3810365A1 (en) * | 1988-03-26 | 1989-10-05 | Schlafhorst & Co W | METHOD AND DEVICE FOR DETERMINING THE COIL SCOPE OF CRANES AND FOR EVALUATING THE RESULT |
US4920274A (en) * | 1989-04-03 | 1990-04-24 | Ppg Industries, Inc. | Metering apparatus and method for the measurement of a fixed length of continuous yarn or strand |
US4954720A (en) * | 1990-01-03 | 1990-09-04 | Ppg Industries, Inc. | Metering apparatus and method for the measurement of a fixed length of continuous strand |
US5402353A (en) * | 1993-05-28 | 1995-03-28 | Htrc Automation Inc. | Method and apparatus for producing a primary roll of material |
DE4327587A1 (en) * | 1993-08-17 | 1995-02-23 | Schlafhorst & Co W | Method for determining the production output of a textile machine producing cross-wound bobbins |
DE4339217A1 (en) * | 1993-11-18 | 1995-05-24 | Schlafhorst & Co W | Bobbin winder control |
FI106787B (en) * | 1998-10-07 | 2001-04-12 | Tamfelt Oyj Abp | Procedure and arrangement in connection with a flushing machine |
FR2867173B1 (en) * | 2004-03-08 | 2006-04-21 | Rieter Textile Machinery Fr | METHOD FOR RESETTING THE LENGTH COUNT OF WIRE COILS |
US9695628B2 (en) * | 2012-05-08 | 2017-07-04 | Guardian Industries Corp. | Vacuum insulated glass (VIG) window unit including pump-out tube protection ring and/or cap and methods for making same |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4818821B1 (en) * | 1969-04-09 | 1973-06-08 | ||
DE2216960B2 (en) * | 1971-04-09 | 1977-04-14 | Nippon Seren Co. Ltd., Kawasaki, Kanagawa (Japan) | THREAD LENGTH MEASURING DEVICE |
JPS4814032U (en) * | 1971-06-24 | 1973-02-16 | ||
US3739996A (en) * | 1971-06-29 | 1973-06-19 | Murata Machinery Ltd | Measuring apparatus of total yarn length wound in package on a yarn winder |
US3860185A (en) * | 1973-12-28 | 1975-01-14 | Nippon Selen Co Ltd | Rotation detector in a fixed length yarn winding apparatus |
US3988879A (en) * | 1974-07-08 | 1976-11-02 | Nuova San Giorgio S.P.A. | Method and apparatus for yarn length measuring |
GB1495003A (en) * | 1974-08-14 | 1977-12-14 | Kdg Instr Ltd | Method and apparatus for measuring length |
DE2502553A1 (en) * | 1975-01-23 | 1976-07-29 | Zinser Textilmaschinen Gmbh | Winding yarn packages of equal and adjustable length - esp. fine yarns, with adjustment at one central point |
DE2525545A1 (en) * | 1975-06-07 | 1976-12-23 | Stueber Kg Otto | Spinning machine yarn length controlling device - with individual yarn length counters resetable by common remote resetting device |
CH635300A5 (en) * | 1979-04-10 | 1983-03-31 | Zellweger Uster Ag | METHOD AND DEVICE FOR OBTAINING PRE-DETERMINABLE AND ACCURATE YARN LENGTHS ON CROSS REELS. |
US4373266A (en) * | 1980-11-05 | 1983-02-15 | Loepfe Brothers Limited | Equipment for continuously measuring the length of an endless material being wound up into a circular package |
CH663402A5 (en) * | 1981-12-04 | 1987-12-15 | Loepfe Ag Geb | METHOD FOR DETERMINING THE YARN LENGTH WINDED ON A CROSS REEL WITH FRICTION DRIVE BY A SLOT DRUM. |
JPS58187552U (en) * | 1982-06-07 | 1983-12-13 | 日本セレン株式会社 | Fixed length winding device for spinning thread winding machine |
-
1984
- 1984-03-22 GB GB848407465A patent/GB8407465D0/en active Pending
-
1985
- 1985-01-16 IN IN32/MAS/85A patent/IN163635B/en unknown
- 1985-02-15 EP EP85101669A patent/EP0157134B1/en not_active Expired
- 1985-02-15 DE DE8585101669T patent/DE3562477D1/en not_active Expired
- 1985-03-20 JP JP60054708A patent/JPS60213667A/en active Pending
-
1987
- 1987-03-16 US US07/026,472 patent/US4715550A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPS60213667A (en) | 1985-10-25 |
GB8407465D0 (en) | 1984-05-02 |
IN163635B (en) | 1988-10-22 |
DE3562477D1 (en) | 1988-06-09 |
EP0157134A1 (en) | 1985-10-09 |
US4715550A (en) | 1987-12-29 |
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